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99 lines
3.6 KiB
99 lines
3.6 KiB
#ifndef Py_SYMTABLE_H |
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#define Py_SYMTABLE_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* A symbol table is constructed each time PyNode_Compile() is |
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called. The table walks the entire parse tree and identifies each |
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use or definition of a variable. |
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The symbol table contains a dictionary for each code block in a |
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module: The symbol dictionary for the block. They keys of these |
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dictionaries are the name of all variables used or defined in the |
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block; the integer values are used to store several flags, |
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e.g. DEF_PARAM indicates that a variable is a parameter to a |
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function. |
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*/ |
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struct _symtable_entry; |
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struct symtable { |
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int st_pass; /* pass == 1 or 2 */ |
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const char *st_filename; /* name of file being compiled */ |
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struct _symtable_entry *st_cur; /* current symbol table entry */ |
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PyObject *st_symbols; /* dictionary of symbol table entries */ |
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PyObject *st_stack; /* stack of namespace info */ |
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PyObject *st_global; /* borrowed ref to MODULE in st_symbols */ |
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int st_nscopes; /* number of scopes */ |
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int st_errors; /* number of errors */ |
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char *st_private; /* name of current class or NULL */ |
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PyFutureFeatures *st_future; /* module's future features */ |
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}; |
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typedef struct _symtable_entry { |
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PyObject_HEAD |
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PyObject *ste_id; /* int: key in st_symbols) */ |
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PyObject *ste_symbols; /* dict: name to flags) */ |
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PyObject *ste_name; /* string: name of scope */ |
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PyObject *ste_varnames; /* list of variable names */ |
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PyObject *ste_children; /* list of child ids */ |
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int ste_type; /* module, class, or function */ |
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int ste_lineno; /* first line of scope */ |
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int ste_optimized; /* true if namespace can't be optimized */ |
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int ste_nested; /* true if scope is nested */ |
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int ste_child_free; /* true if a child scope has free variables, |
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including free refs to globals */ |
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int ste_generator; /* true if namespace is a generator */ |
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int ste_opt_lineno; /* lineno of last exec or import * */ |
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int ste_tmpname; /* temporary name counter */ |
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struct symtable *ste_table; |
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} PySymtableEntryObject; |
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PyAPI_DATA(PyTypeObject) PySymtableEntry_Type; |
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#define PySymtableEntry_Check(op) ((op)->ob_type == &PySymtableEntry_Type) |
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PyAPI_FUNC(PyObject *) PySymtableEntry_New(struct symtable *, |
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char *, int, int); |
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PyAPI_FUNC(struct symtable *) PyNode_CompileSymtable(struct _node *, const char *); |
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PyAPI_FUNC(void) PySymtable_Free(struct symtable *); |
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#define TOP "global" |
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/* Flags for def-use information */ |
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#define DEF_GLOBAL 1 /* global stmt */ |
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#define DEF_LOCAL 2 /* assignment in code block */ |
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#define DEF_PARAM 2<<1 /* formal parameter */ |
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#define USE 2<<2 /* name is used */ |
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#define DEF_STAR 2<<3 /* parameter is star arg */ |
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#define DEF_DOUBLESTAR 2<<4 /* parameter is star-star arg */ |
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#define DEF_INTUPLE 2<<5 /* name defined in tuple in parameters */ |
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#define DEF_FREE 2<<6 /* name used but not defined in nested scope */ |
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#define DEF_FREE_GLOBAL 2<<7 /* free variable is actually implicit global */ |
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#define DEF_FREE_CLASS 2<<8 /* free variable from class's method */ |
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#define DEF_IMPORT 2<<9 /* assignment occurred via import */ |
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#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT) |
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#define TYPE_FUNCTION 1 |
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#define TYPE_CLASS 2 |
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#define TYPE_MODULE 3 |
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#define LOCAL 1 |
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#define GLOBAL_EXPLICIT 2 |
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#define GLOBAL_IMPLICIT 3 |
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#define FREE 4 |
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#define CELL 5 |
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#define OPT_IMPORT_STAR 1 |
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#define OPT_EXEC 2 |
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#define OPT_BARE_EXEC 4 |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* !Py_SYMTABLE_H */
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